Hydraulic pump



Aug. 1s, 1931.

Filed July 25, 1929 HYDRAULIC PUMP 3 Sheets-Sheet l Aug, 18, 1931.

P. O. OTT

HYDRAULIC PUMP Filed July 25 1929 3 Sheetg-S'heet 2 Aug. 18, 1931.

P. o. oTT

HYDRAULIC PUMP Filed July 25, 1929 3 Sheets-Sheet YI5 g" DeVito@ Patented Aiug. 1S, 1931 `'UNITED STATES PERCY OLIVER'O'IT, OF ROCKFORD, ILLINOIS, ASSIGNOR T0 RACINE TOOL& MACHINE COMPANY, OF RACINE, WISCONSIN, A CORPORATION OF WISCONSIN HYDRAULIC PUMP Application led July 25, 1929. Serial No. 380,939. v

The invention relates to hydraulic pumps. The general object of the invention is to provide a rotary type hydraulic pump of simple construction and high capacity and capable of efficient operation at high speed. More particularly the construction provides for varying the capacity of the pump by varying the eccentricity of the pump casing relative to the rotor and for controlling the delivery of the pressure fluid to devices adapted to be actuated thereby.

A further object of the invention is to provide a pump having a rotor equipped withV inlet and discharge valves and vanes or blades working in' a casing including a cylindrical member which is free to revolve with the rotor during the working cycle ofthe pump and is adapted to be shifted relative to the axis ofthe rotor to varythe pump delivery. 2o A further object of the invention is to provide a rotary pump of the character above described having a priming means driven from the rotor shaft. Y

The inventionfurther consists in the several featureshereinafter set forth and more particularly defined by claims at the conclusion hereof. v

In the drawings Fig.v lfis a vertical, sectional view through a pumpiembodying the 3o invention, taken on the line 1 1 of Fig. 2;

Fig. 2 is a horizontal sectional view through the pump taken along the line 2 2 of Fig. 1; Fig. 3 is a detailfsectional viewof the de# 3b' livery control valve taken along the line'3 3 of Fig. 1, showing the parts in one position; l l j v 31- inthe body and `-seat1ngiaga1nst` the seat Fig. 4 is a View similar to Fig. 3, on line 4 4 of Fig. 1 Ashowinglthe parts in another position;

the'pump taken on the line 5 5 of Fig. 2; Fig. 6 is a view similar to Fig. 5 showing the parts in another position.

n cludes a. sectional casing or housing comprising the end sections 7 and Sand the intermediate sectionv 9, adjacent sections having interfitting end engagement with each other and all the sections clamped together by four Fig. 5 is a transverse sectional view through Referringto the drawings, the pump in throu h bolts 10 which have been omitted from ig. 1 for the sake of clearness. Y

The rotor 11 has a shaft portionl2 journaled in a ball'bearing journal 13 mounted .in the inner wall 14 of the section 7 and a shaft portion 15 journaled in a ball bearing journal 16 mounted in an end Wall 9 of the casing section 9.

The rotor 11 has a .main cylindrical body' passages 24 communicating with an axlally j extending discharge bore or passage 25.y

Passage of the fluid from the inlet passages 21 to the space 26 between the body of the rotor and the ring 20 is controlled by any suitable form of check valves, butI I prefer the ball valves 27, seatable against the` outer ends of the ports or passages 21 and mounted in the recesses 28 formed in the body and limited in their outward movement by the apertured screw caps 29.

Passage of the fluid to the sets of discharge passages 24 isin each instance cont-rolled by another lcheck valve which preferably is 'a ball valve 30 working in' the enlarged vrecess ring 32 in threaded engagement with the body..

'Ihese checkfvalves may be normally held to their seats by the usual springs, but as I have found/they are not necessary to the satisthe rotor but are offset to one side thereof and a vane or blade 35 is slidably mounted in each of these slots with a nice working fit and have curved edges 36 formed to conform to the curvature of the inner surface of the ring 20 against which they are constantly urged by a plurality of springs 37 bearing at one of their ends against the flat rear faces 'and having an extension 45 for direct or indirect connection with an elect-ric motor or other suitable prime mover.

The inner races of the journal 13 are secured to the rotor against a shoulder 46 b a spacer ring 47, eccentric 48 and a clamping nut 49 and the inner race of the journal 16 is secured against a shoulder 50 by a nut 51 and lock Washer 52.

The passage 24 in the shaft portion 15 discharges into a conduit or passage 53 in the casing section 8 and for sealing the bore 54 through which said shaft projects I provide a hardened steel ring 55 seating against the shoulder 56 of the rotor shaft, a rin 57 of hard fibre abutting the ring 55 and aving a bevelled edge 58 in abutting engagement with the similarly bevelled edge of a bronze ring 59 which has a close fit inthe bore 54, a spring 60 being interposed .between the outer end of the ring 86 and the stationary casing and acting to hold these rings in abutting engagement with each other.

The cylindrical member or ring 20 forming the barrel of the pump casing has an annular groove 61 formed therein and a sectional roller bearing 62 is disposed i'n this groove and within the confines of a ring-shaped support 63 which is provided with a forked lower end 64 receiving a pivot pin or bolt 65 also extending through a lug 66 in the casing section 9, suitable provision being made for holding this support 63 in different positions of angular adjustment relative to the axis of the rotor, as hereinafter described.

The space 67 within the end casing section 7 constitutes a reservoir which may be supplied with oil through the filling opening 68 r a return from the system and also from a pump driven from the rotor and incorporated vin the casing section 7 and here shown as a plunger 69 working in the bore 70, formed in the casing 7 and reciprocated by the eccentric or cam 48 against which it is held by a spring 71 mounted at one end in a bore of said plunger and engaging a plug 72 at its other end, said pump including a ball check inlet valve 73 limited in its movement by a. stop pin 74 and a ball check discharge valve 75 limited in its movement by a stop pin 7 6, the valve 7 3 controlling the passage of fluid from the interior 77 of the casing 9 into the pump casing 78 and the valve 75 its discharge to a pipe 79 communicating with the reservoir 67.

The interior 77 of the casing section 9 is also through openings 80 in communication with the interior 81 of the casing section 8 so that any slight leakage of the working fluid through the joints previouslyv described finds its way into the interior 77 from which it is drawn out by thepriming pump above described and discharged into the reservoir 67.

With the above construction and referring more particularly to Figs. 3 and 4 and assuming clockwise rotation of the rotor, during the time the vanes are passing through the lower half of their revolution the space 26 between the body of the rotor and the ring 20 is gradually enlarged and suction takes place, the balls 27 rising off their seats during this time to admit the fluid from passage 22 and ports 2l into said space, and as said vanes pass through the upper half of their revolution the space between them andthe rotor and ring 20 gradually contracts and the fluid is discharged past the ball valves 30 into the discharge line 25 and at the desired working pressure. It is, however, to be noted that the vanes 35 do not revolve relative to the ring 2O but, by reason ofthe angular disposition o f said vanes relative to said ring and the fact that the roller bearings 62 offer no appreciable resistance to its turning and its ends work on the end plates, said ring revolves with the vanes but owing to the factthat the support or guide for the ring is eccentrically disposed relative to the axis of the rotor, the blades or vanes 35 move in and out and cooperate with the rotor and barrel to accomplish the pumping action, as above described. Since the travel of the blades in and out relative to the rotor is dependent upon the eccentricity of the ring 20 relative to the rotor, it will be noted that decreasing this eccentricity reduces the volumes of liquid handled between thev blades and finally at zero eccentricity or when the center of the revolution of the ring 20 coincides with the axis of rotation of the shaft, no displacement by the rotor and no reciprocating movement of the blades takes place and no liquid will be pumped. Furthermore, it will be noted that in this device the rotor with its vanes and the ring 20 provides a series of radially disposed pumpmg chambers in which the pumping cycle successively takes place as the rotor revolves 'to discharge the fluid into the discharge passaoes 25 and 53 and at hi h speeds a great volume of f luid may be rea ily and eiiiciently handled in this manner atpressures suitable for working needs.

Any suitable means may be used for adjusting and maintaining the support 63 in the desired angular adjustment and as one example I show said support 63 provided with a stud 82 opposite its pivot 65 and projecting upwardly through an' opening 83 into the pathof a manually adjustable screw 84 in threaded engagement with a lug in the casing section 9, the reaction of the moving parts tending to hold the stud 82 against the screw, which may be turned in or out in its mounting .in the casing to respectively swing said support toward the left or permit its return movement toward the right and thus vary the eccentricity of the pump cylinder 20.

This action Jfurnishes an almost steady flow of pressure fluid to the discharge passage 53 and in case the pressure of this fluid exceeds the desired working pressure a relief valve 85, normally held to its seat by a spring 85 over a by-pass 86,` opens to permit the fluid to flow by way of port 86 into the interior 81 and thence by way of the chamber 77 to the priming pump.'

Where the flow of pressure fluid is used to drive reciprocating I elements, the reversing valve 'structure yshown 'in Figs. 5 and 6 controls the deliveryof the pump and includes a cage 87 mounted inthe casing section 8 and housing a rotary cylindrical plug valve 88 whose inner end 89'is journalled in a bore 90 .in the section'8 and -whose outer end portion works against a sealing ring 91 in the cage 87 and has an exteriorly disposed shaft projection 92 for manual or powercontrol.

Thisvalve 88 has a lcentrally disposed inlet 93 communicating with the discharge 53 and provided with radially disposed ports 94 and-95 and a by-pass groove 96.

Where the device is used to control the flow of pressure fluid to and from a main cylinder the registering ports 97, 97 lead to the main cylinder and ports 98, 98 conduct the return from said cylinder and ports 99, 99 are connected by a return passage 100 with the re- A serve reservoir 67, said passage including a pipe 101 whose ends are in sealing Contact with the adjacent parts of the casing sections.

With the above construction, when the valve is turned to theA position shown in Fig.

5 the pressure fluid delivered by the pump, passes through the passage 93, ports 94, 97,f'/1f.'v

97 to one side.` of the main cylinder to move [the piston therein in one .direction while the fluid on the other `s ide o f the piston is exhausting through ports 98,- 98, groove'96, through ports 991, 99 to passage 100.- When the valve is turned vto the position shown in Fig. 6 the pressure -iuid Adelivered by the pump passes through the passage 93, ports 95, 98, 98 to the-other side of the main cylinder whileithe fluid is -being exhausted from the first side through the ports 97 97, groove 96, ports 99', 99 to passage 100. f

' Thus the'valve structure above described cip1`ocation of a piston or other part working in a cylinder connected with the pump.

I desire it to be understood that this invention isnot to be limited to any particular form or arrangement of parts except insofar as such limitations are included in the claims.

What I claim as my invention is 1. In a hydraulic pump, the combination of a rotor having a body portion formed to provide an annular space, a ring member revolving with said rotor and fitting within said space and defining with the sides thereof a chamber, reciprocating blades mounted in the body of the rotor and working within said annular 'space and defining with said rotor and ring member a plurality of pumping compartments, valve-controlled inlet and discharge passages in the rotor communicating with said compartments, and adjustable means in which said ringv member is freely journalled for varying the position of said "ring member relative to the axis of rotation of the rotor to vary the output of the pump. 2.v In a hydraulic pump, the combination of a rotar 'having inlet and discharge passages formed therein, valves mountedin said rotor and controlling said passages, a casing mem'ber revolvable with but eccentrically movable relative tothe rotor and defining therewith a pumping space, and reciprocating blades working in the rotorv and against said member and dividing said space into a plurality of pumping compartments, said blades being offset relative to the axis of the rotor and acting to revolve said'member with the rotor during the pumping cycle.

' 3. In a hydraulic pump, the combination of a housing having a supply chamber formed in one end and a discharge passage formed in the other end, a rotor journalled in said housing with hollow shaft portions respectively communicating with said supply cham- `ber and said discharge passage, means for sealing the revolving connection between the discharge end of the rotor and that portion of the casing containing said discharge passage, said rotor having a cylindrical body ,j portion provided with flanged ends, aring 'member having working contact with lsaid flanged ends and surrounding'said body portion of saidrotor' and defining therewith a 'working space, blades slidably'mounted in the rotor and engaging said ring and oset relative to the axisofthe rotor and diyiding said space into a plurality of pumping 'chambers, valve-controlled inlet passages leading from the inlet passage'of 'said shaft tosaid chambers, valve-controlled discharge` pas sages leading Afrom said chambers to the discharge passage in the shaft of the rotor, and

means for varying the eccentricity of lsaid ring member relative to the axis of rotation of the rotor to vary thecapacity of the pump. 4. i In a vhydraulic"pump, the -combination of a liousin'ghaving'a supply chamber formed in lone endv anda discharge passage formed in the other end`,"a rotorj'ournalledin sind .h,uS

ing 'with hollow shaft portions respectively communicating; with saidsupply A'chamber and'said discharge passa-ge', means for-sealing the revolving lconnection between v the discharge end of the rotor and that portion of the casing .containing said discharge passage, said rotor having a cylindrical body portion provided with ianged ends, aring member having working contact 4with said iianged ends and surrounding said body portion of said rotor and defining therewith a Working space, blades slidably mounted in the rotor and engaging said ring and offset relative tov the axis of the rotor and dividing said space into a plurality of pumping chambers, valvecontrolled inlet passages leading -from the inlet passage of said shaft to said chambers, valve-controlled discharge passages leading from said chambers to the discharge passage in the shaft of the rotor, a pivotal support for said ring member, a roller bearing journalled between said support and said ring member, and manually controlled means for shifting said support to vary the eccentricity of said ring member relative to said rotor to vary the capacity of the pump.

5. In a hydraulic pump, the combination of a sectional casing having an intermediate section land en? sections detachably secured together, said end sections having fluid-receiving spaces, a rotor Journalled in said casing and having a body portion having flanged with the other hollow shaft portion, means for controlling the positionv of said barrel member relative to the axis of rotation of the rotor to vary the capacity of the pump, a

priming pump having its casing lformed in one of said casing sections, and'having a valve-controlled inlet port communicating with the space in the intermediate section sur- `rounding the rotor and a valve-controlled discharge passage communicating with the fluidreceiving space of one of said end sections, and a reciprocating plunger driven by said rotor. i v v 6. In a hydraulic pump, the combination `I member and dividing of a rotor having inlet and discharge passages formed therein, valves' controlling said pascontrol valve in said supply passage provided i with a plurality of discharge ports and a return port, and a rotary valve cooperating with said ports to permit the discharge of pressure iiuid into either of said ports and the return of iiuid from the other of said discharge ports to said return port, said casing having' a passage connecting said return port with said supply chamber.

7. In ahydrauiic pump, the combination of a housing, of a rotor journalled in said housing having a cylindrical body portion provided with hanged ends and 'hollow shaft portions, radially disposed passages in said body portion communicating with the passage pi ovided by one of said hollow shaft por tions, ball valves controlling the 'supply of working fluid through said passages, radially disposed passages'in said body portion communicating with the passage provided by the portion connecting said supply other of said hollow shaft portions, ball valves l controlling the discharge of pressure fluid to said lastnamed passages, a ring member revolving with the rotor and .defining therewith a pumping space, and reciprocating blades working in the rotor and against said i said space into a plurality of pumping compartments with which `said radially 'disposedinlet and discharge passages communicate, and means for varying the position of said ring member relative to the axis of rotation of the rotor to vary the capacities of said pumping compartments.

8. In a hydraulic pump, the combination of a casing, a rotor journalled in said casing -with inlet and outlet passages formed therein, said rotor havin a cylindrical body portion provided with anged ends, ber haviiigworking contact with ends and surrounding said bgdy portion of said rotor and defining therewith a workingspace', blades slidably mounted in the-rotor and engaging said ring and offset relative to the axis of the rotor and dividing said space into a plurality of pumping compartments, a Valve for each compartment mounted in the body portion of the rotor for controlling said a ring memsaid flanged.

iis

inlet passages, a valve for each compartment mounted in the body portion of the rotor -for controlling said outlet passages, and means formin a journal for said ring member and adjusta le angularly to vary the eccentrioity of said ring member relative to the axis of rotation of the rotor to vary the capacity of the pump.

In testimony whereof, I ax my signature.

PERCY OLIVER OTT. 

